. 2019 May 16;6:e8. doi: 10.1017/gmh.2019.7
© The Author(s) 2019
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited
Fig. 1.
Participants' flow.